[Numpy-discussion] Coordinate Camera Optics for Astrophotography -- sin(zenith)

[Wayne Watson]

Certainly azimuth arcs get smaller as one gets closer to the zenith, so 
I think it's a formulation of that. It's sort  of like the latitude example.

On 6/3/2010 9:36 AM, Friedrich Romstedt wrote:
> Maybe it has to do with the fact that at the zenith any difference in
> rectascension means essentially no change?
>
> Friedrich
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            Wayne Watson (Watson Adventures, Prop., Nevada City, CA)

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